Management View Reference

This topic contains reference information about each workload profiling management view.

Concepts and Terminology

Before querying these management views, it’s important to understand the concepts behind the terminology used in each view’s schema.

Task

MemSQL is instrumented to divide its execution time into tasks. Workload profiling management views in the information_schema database report the resource usage of sets of tasks. The views differ mainly in that they report on different sets over different intervals of time.

Task Examples

  • A single query’s execution is instrumented with a task per partition, as well as a single task on the relevant aggregator.
  • A single garbage collection pass is instrumented with a single task.
  • A single replication pass against a database partition is instrumented with a single task.
  • Tasks may or may not be successful. For example, a query task which commits a transaction is successful, but a query task which encounters rollback is not.

Activity

An activity is a set of identical tasks.

All tasks associated with the same node ID, database, partition, and name comprise the same activity. The tasks in an activity can be considered to share or be instances of an activity.

In practice, tasks share an activity when they instrument multiple repetitions of the same recurring work.

Every activity has a type of either Query, Database, or System. Tasks in a database activity are those which can be associated with an individual database, but not with any individual query. Tasks in a system activity can be associated with neither.

Every activity has a name and an aggregator activity name. We say that an activity is high-level if its aggregator activity name is either NULL or equal to its name.

If an activity is not high-level, then its aggregator activity name is the name of the high-level activity to which it contributes.

In practice, we report aggregator activity name in order to link per-partition query activities with the unique aggregator activity associated with their query. The actual name of these activities may not be the same on all nodes.

Activity Examples

  • All tasks instrumenting the same query against the same partition share an activity, which has Query type. Tasks instrumenting the query on different partitions have different activities.
  • All garbage collection pass tasks share an activity, which has System type.
  • All replication tasks against the same database partition share an activity, which has Database type.
  • All activities associated with a query have the same aggregator activity name, which is the name of the unique high-level activity associated with the query on the aggregator node.

mv_activities

The mv_activities view in the information_schema database is a high-level summary profile of all tasks which ran recently on any node in the cluster.

It holds a row per high-level activity H. Each row describes the set of tasks which have run over a recent interval of time and which are either instances of the high level activity H, or else instances of an activity L whose aggregator activity name is the name of H. It reports the sum of the profiling statistics of each task in the set, as collected over the recent interval.

The effect of grouping the instances of multiple activities together is mainly to group all tasks associated with a query, across all partitions, into a single row.

mv_activities determines recent resource use by computing the change in mv_activities_cumulative over an interval of time. This interval is controlled by the value of the activities_delta_sleep_s session variable.

mv_activities may only be queried while connected to an aggregator node.

We recommend using this view to begin a performance investigation, as it is the most concise.

However, we recommend against the use of mv_activities to compute the average latency or resource usage of a query. This is because its statistics include the latency and resource usage of currently running tasks, which will skew attempted average calculations. We recommend mv_finished_tasks for this purpose instead.

Column name Description
activity_type The type of the high-level activity.
activity_name The name of the high-level activity. This column is often human-readable, but does not include the full query text for query tasks. Join with mv_queries for the query text.
database_name The name of the database associated with the activity, or NULL if none could be assigned.
run_count The number of instances which were running at the end of the interval.
success_count The number of instances which completed successfully during the interval.
failure_count The number of instances which completed unsuccessfully during the interval.
SIMPLIFIED STATISTICS This view contains all simplified statistics columns.

mv_activities_extended

The mv_activities_extended view in the information_schema database is a detailed profile of all tasks which ran recently on any node in the cluster.

It holds a row per activity. Each row describes the instances of its activity which ran during a recent interval of time. It reports the sum of the profiling statistics of each task in the set, as collected over the recent interval.

mv_activities determines recent resource use by computing the change in mv_activities_extended_cumulative over an interval of time. This interval is controlled by the value of the activities_delta_sleep_s session variable.

mv_activities_extended may only be queried while connected to an aggregator node.

We recommend using this view to get fine-grained understanding of the system behavior described in mv_activities. The main distinctions between mv_activities and mv_activities_extended are:

  • For most queries, mv_activities_extended will report the resource usage of the query with at least a row per partition. mv_activities aggregates these into a single row per query.
  • mv_activities reports simplified statistics, while mv_activities_extended reports extended statistics.

However, we recommend against the use of mv_activities_extended to compute the average latency or resource usage of a query. This is because its statistics include the latency and resource usage of currently running tasks, which will skew attempted average calculations. We recommend mv_finished_tasks for this purpose instead.

Column name Description
node_id An ID equal to id in the row of mv_nodes describing the node on which the instances ran.
activity_type The type of the activity.
activity_name The name of the activity. This column is often human-readable, but does not include the full query text for query tasks. Join with mv_queries for the query text.
aggregator_activity_name The aggregator activity name of the activity, which may be NULL.
database_name The name of the database associated with the activity, or NULL if none could be assigned.
partition_id The unique ID of the database partition associated with the activity, or NULL if none could be assigned.
run_count The number of instances which were running at the end of the interval.
success_count The number of instances which completed successfully during the interval.
failure_count The number of instances which completed unsuccessfully during the interval.
EXTENDED STATISTICS This view contains all extended statistics columns.

mv_activities_cumulative

The mv_activities_cumulative view in the information_schema database is a high-level summary profile of completed and currently running tasks on all nodes of the cluster.

It holds a row per high-level activity H. Each row describes tasks which have completed or are currently running, and which are either instances of the high level activity H, or else instances of an activity L whose aggregator activity name is the name of H. It reports the sum of the profiling statistics of each task in the set, as collected over its lifetime.

The effect of grouping the instances of multiple activities together is mainly to group all tasks associated with a query, across all partitions, into a single row.

mv_activities_cumulative may only be queried while connected to an aggregator node.

We recommend against extensive use of this table. It doesn’t accurately describe past system behavior because it doesn’t include all completed instances. This is because historical task statistics may be discarded by MemSQL at unspecified times.

Column name Description
activity_type The type of the activities.
activity_name An ID shared by all instances of the high level activity. This ID is often human-readable, but does not include the query text for query tasks. See mv_queries for the raw query text.
database_name The name of the database associated with the activity, or NULL if none could be assigned.
last_finished_timestamp The timestamp of the most recent completion of an instance of this activity.
run_count The number of running instances of the activity.
success_count The number of successfully completed instances of the activity.
failure_count The number of unsuccessfully completed instances of the activity.
SIMPLIFIED STATISTICS This view contains all simplified statistics columns.

mv_activities_extended_cumulative

The mv_activities_extended_cumulative view in the information_schema database is a detailed profile of completed and currently running tasks on all nodes of the cluster.

It holds a row per activity. Each row describes completed and currently running instances of its activity. It reports the sum of the profiling statistics of each instance, as collected over its lifetime.

mv_activities_extended_cumulative may only be queried while connected to an aggregator node.

We recommend against extensive use of this table. It doesn’t accurately describe past system behavior because it doesn’t include all completed instances. This is because historical task statistics may be discarded by MemSQL at unspecified times.

Column name Description
node_id An ID equal to id in the row of mv_nodes describing the node on which the activity’s instances have run.
activity_type The type of the activity.
activity_name An ID shared by all instances of the activity. This ID is often human-readable, but does not include the query text for query tasks. See mv_queries.
aggregator_activity_name The aggregator_activity_name of the activity.
database_name The name of the database associated with the activity, or NULL if none could be assigned.
partition_id The unique ID of the database partition associated with the activity, or NULL if none could be assigned.
last_finished_timestamp The timestamp of the most recent completion of an instance of this activity.
run_count The number of running instances of this activity.
success_count The number of successfully completed instances of this activity.
failure_count The number of unsuccessfully completed instances of this activity.
EXTENDED_STATISTICS This view contains all extended statistics columns.

mv_aggregated_column_usage

The mv_aggregated_column_usage view in the information_schema database provides a summary of mv_query_column_usage, aggregating over the columns over all queries run.

Column name Description
database_name The name of the database, or NULL if none could be assigned.
table_name The name of the table to which the column belongs.
column_name The aggregated column information is displayed for this column.
equijoins The number of equijoins this column has been involved in over all queries run over the table.
inquality_joins The number of inquality joins this column has been involved in over all queries run over the table.
equality_preds The number of equality predicates in the WHERE or ON clause this column has been involved in all queries run on the table.
inequality_preds The number of inequality predicates in the WHERE or ON clause this column has been involved in all queries run on the table.
groupbys The number of GROUP BY clause in the column involved in all queries run on the table.
reshuffles The number of reshuffle key in the column, involved in all queries run on the table.
orderbys The number of ORDER BY clause in the column involved in all queries run on the table.
outputs The number of times the column was returned as the result of a query.
query_appearances The number of distinct queries the column appears in all queries run on the table, which is equivalent to the number of times the column appears in the first table.

mv_blocked_queries

The mv_blocked_queries view in the information_schema database provides a summary of activities that are currently unable to complete (“blocked queries”) because they are “blocked” by another activity (“blocking queries”).

Column name Description
node_id ID of the node running the blocked query.
id ID of the blocked query.
query_text The text of the blocked query.
blocking_node_id ID of the node that is running the blocking query.
blocking_id ID of the blocking query.
blocking_type Information on the type of block. Could be internal transaction, user transaction, or a DDL lock for a specific type of object (table, database, pipeline, etc.).
blocking_query_text The text of the blocking query, or a description of the connection. For example: “open idle transaction”.

Example mv_blocked_queries Results

NODE_ID ID QUERY_TEXT BLOCKING_NODE_ID BLOCKING_ID BLOCKING_TYPE BLOCKING_QUERY_TEXT
1 42 insert into t values (1) 1 17 user transaction open idle transaction

Both id and blocking_id refer to the “id” from information_schema.processlist. This means you can join information_schema.mv_blocked_queries with information_schema.processlist to get more detail about the blocked or blocking process.

Once you know the query or connection responsible for blocking, you can use KILLALL QUERIES or KILL CONNECTION to unblock your process.

mv_collected_row_change_counts

The mv_collected_row_change_counts view in the information_schema database displays the best-effort counter for the number of changes that have been observed for the table partitions over time, and persisted to disk.

Column name Description
table_name The name of the table in the database.
database_name The name of the database associated with the activity.
partition The table partition in the database.
total_changes The total number of changes for table partitions over a period of time.
last_analyzed_total_changes The last recorded change count, when the statistics collection was triggered based on the metadata.

mv_finished_tasks

The mv_finished_tasks view in the information_schema database is a detailed profile of completed tasks on all nodes of the cluster.

It holds a row per activity. Each row describes completed instances of its activity. It reports the sum of the profiling statistics of each instance, as collected over its lifetime.

mv_finished_tasks may only be queried while connected to an aggregator node.

We recommend against extensive use of this table. It doesn’t accurately describe past system behavior because it doesn’t include all completed instances. It will also hide the performance impact of long-running tasks which have yet to complete.

However, we do recommend using this table to estimate the average latency or resource usage of a query. This is because all other statistics tables include currently running tasks in their profiles, skewing attempted average calculations.

Column name Description
node_id An ID equal to id in the row of mv_nodes describing the node on which the activity’s instances ran.
activity_type The type of the activity.
activity_name An ID shared by all instances of the activity. This ID is often human-readable, but does not include the query text for query tasks. Join with mv_queries for the query text.
aggregator_activity_name The aggregator_activity_name of the activity.
database_name The name of the database associated with the activity, or NULL if none could be assigned.
partition_id The unique ID of the database partition associated with the activity, or NULL if none could be assigned.
last_finished_timestamp The timestamp of the most recent completion of an instance of the activity.
success_count The number of successfully completed instances of this activity.
failure_count The number of unsuccessfully completed instances of this activity.
EXTENDED STATISTICS This view contains all extended statistics columns.

mv_global_status

The mv_global_status view in the information_schema database contains information on the global server status variables that are set on the cluster’s nodes. Global variables which are not server status variables are found in the mv_global_variables view.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
node_type MA, Leaf, or CA
variable_name The name of the global variable.
variable_value The value of the global variable.

mv_global_variables

The mv_global_variables view in the information_schema database contains information about the global variables that are set on the cluster’s nodes. Global variables which are server status variables are not included and are found in the mv_global_status view.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
node_type MA, Leaf, or CA
variable_name The name of the global variable.
variable_value The value of the global variable.

mv_tasks

The mv_tasks view in the information_schema database is a detailed profile of all currently running tasks on all nodes of the cluster.

It holds a row per running task. Each row reports the profiling statistics of the task, as collected between the time it began and the current time.

mv_tasks may only be queried while connected to an aggregator node.

We recommend against extensive use of this table. It will hide the performance impact of short-lived but frequent tasks, and exaggerate the impact of long-lived tasks.

Column name Description
node_id An ID equal to id in the row of mv_nodes describing the node on which the task is running.
activity_type The type of the task’s activity.
activity_name An ID shared by all instances of the task’s activity. This ID is often human-readable, but does not include the query text for query tasks.
aggregator_activity_name The aggregator_activity_name of the task’s activity.
database_name The name of the database associated with the task’s activity, or NULL if none could be assigned.
partition_id The unique ID of the database partition associated with the task’s activity, or NULL if none could be assigned.
raw_task_name The full name associated with the task, or NULL if none could be assigned. In particular, this will hold the raw query text for query tasks. It differs from query_text in mv_nodes because it is fully parameterized. Note that this column is only available in mv_tasks.
EXTENDED STATISTICS This view contains all extended statistics columns.

mv_nodes

The mv_nodes view in the information_schema database describes all MemSQL nodes in the cluster. It holds one row per node.

mv_nodes may only be queried while connected to an aggregator node.

Column name Description
id The ID of the node. This ID matches the node_id reported for tasks running on the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
type MA, Leaf, or CA.
state Online, Offline, Detached, or Attaching.
availability_group The availability group of the node.
num_cpus The number of logical CPU cores on which the node may execute.
memory_used_mb The value of total_server_memory on the node.
max_memory_mb Maximum allowed memory for node

mv_queries

The mv_queries view in the information_schema database describes queries seen by MemSQL. It holds a row for each query sent to the cluster by a user, as well as rows for artificial queries sent between nodes according to internal MemSQL logic.

Its purpose is to map the activity_name of query activities to their associated de-parameterized query text.

mv_queries may only be queried while connected to an aggregator node.

Column name Description
activity_name The ID associated with the query. This will be the activity_name of all query tasks associated with the query.
query_text The de-parameterized text of the query.

mv_query_activities

The mv_query_activities view in the information_schema database is a high-level summary profile of all the queries that ran recently in the cluster.

Each row describes a query sent to the cluster, as well as queries sent between nodes.

Column name Description
acitvity_name The name of the high-level activity.
query_text The de-parameterized text of the query.
database_name The name of the database associated with the query, or NULL if none could be assigned.
cpu_time_ms Milliseconds spent running on a CPU. If elapsed_time_ms of a leaf query task is equal to cpu_time_ms, you should PROFILE the query.
cpu_wait_time_ms Milliseconds spent waiting for a CPU to become available. A non-zero value indicates that there were more concurrent tasks in the workload than there were CPUs on which to run them. If this value is a significant amount of elapsed time, the workload is likely issuing its queries faster than the hardware can handle. Investigate the tasks with the highest cpu_time_ms and optimize the relevant queries, reduce your workload, or provision more CPUs for your cluster.
elapsed_time_ms Wall clock milliseconds elapsed during execution.
lock_time_ms Milliseconds spent waiting on locks and condition variables, excluding row locks. This isn’t solely wait time due to contention on data structures because it also includes some time spent waiting for events in general.
disk_time_ms Milliseconds spent waiting for physical disk I/O to complete. If this value is high, it may indicate excessive time to commit transactions to storage. You may need hardware which supports a faster write rate, or you may need to investigate whether other processes are issuing too much I/O and introducing unwanted variability. Check which other queries are using disk_physical_read_b or disk_physical_write_b.
network_time_ms Milliseconds spent waiting for sockets to be ready to send or receive data. This may indicate that leaves are slow to respond to a query, or that a distributed join involves a large data transfer. If this counter has a noticeable delay, check what other queries are consuming network_logical_recv_b and network_logical_send_b.
network_b Number of bytes MemSQL sent and received to sockets.
disk_b Number of bytes that MemSQL read and wrote to the filesystem or the in memory transaction log.
memory_bs Byte-seconds of memory used.
memory_major_faults Number of page faults which required disk I/O to resolve.
run_count The number of instances which were running at the end of the interval.
success_count The number of instances which completed successfully during the interval.
failure_count The number of instances which completed unsuccessfully during the interval.
plan_warnings The number of warnings generated during query execution.
plan_info A high-level information of the plan. NULL if not information was collected.

mv_query_activities_extended_cumulative

The mv_query_activities_extended_cumulative view in the information_schema database is a detailed profile of completed and currently running queries on all nodes of the cluster. It holds a row per query.

Column name Description
node_id An ID equal to id in the row of mv_nodes describing the node on which the activity’s instances have run.
activity_name An ID shared by all instances of the activity. This ID is often human-readable, but does not include the query text for query tasks. See mv_queries.
aggregator_activity_name The aggregator_activity_name of the activity.
query_text The de-parameterized text of the query.
aggregator_query_text The aggregator query text.
database_name The name of the database associated with the query, or NULL if none could be assigned.
partition_id The unique ID of the database partition associated with the query, or NULL if none could be assigned.
cpu_time_ms Milliseconds spent running on a CPU. If elapsed_time_ms of a leaf query task is equal to cpu_time_ms, you should PROFILE the query.
cpu_wait_time_ms Milliseconds spent waiting for a CPU to become available. A non-zero value indicates that there were more concurrent tasks in the workload than there were CPUs on which to run them. If this value is a significant amount of elapsed time, the workload is likely issuing its queries faster than the hardware can handle. Investigate the tasks with the highest cpu_time_ms and optimize the relevant queries, reduce your workload, or provision more CPUs for your cluster.
elapsed_time_ms Wall clock milliseconds elapsed during execution.
lock_row_time_ms Milliseconds spent waiting on table row locks.
lock_time_ms Milliseconds spent waiting on locks and condition variables, excluding row locks. This isn’t solely wait time due to contention on data structures because it also includes some time spent waiting for events in general.
disk_time_ms Milliseconds spent waiting for physical disk I/O to complete. If this value is high, it may indicate excessive time to commit transactions to storage. You may need hardware which supports a faster write rate, or you may need to investigate whether other processes are issuing too much I/O and introducing unwanted variability. Check which other queries are using disk_physical_read_b or disk_physical_write_b.
network_time_ms Milliseconds spent waiting for sockets to be ready to send or receive data. This may indicate that leaves are slow to respond to a query, or that a distributed join involves a large data transfer. If this counter has a noticeable delay, check what other queries are consuming network_logical_recv_b and network_logical_send_b.
log_buffer_time_ms Milliseconds spent waiting for space in the transaction log buffer. If this value is nonzero, it is usually indicative of disk issues. See disk_time_ms.
log_flush_time_ms Milliseconds spent waiting for transaction log records to be flushed to disk. If this value is nonzero, it is usually indicative of disk issues. See disk_time_ms.
network_logical_recv_b Bytes received from a socket.
network_logical_send_b Bytes written to a socket.
disk_logical_read_b Bytes read from the filesystem.
disk_logical_write_b Bytes written to the filesystem.
disk_physical_read_b Bytes actually read from physical disk. This may be higher or lower than the logical number due to hardware and operating system artifacts and optimizations.
disk_physical_write_b Bytes actually written to physical disk. This may be higher or lower than the logical number due to hardware and operating system artifacts and optimizations.
memory_bs Byte-seconds of memory used.
memory_major_faults Number of page faults which required disk I/O to resolve.
pipeline_extractor_wait_ms The amount of time, in seconds, that the pipeline spent waiting on the extractor to complete its operation.
pipeline_trasnform_wait_ms The amount of time, in seconds, that the pipeline spent waiting on the transform to complete its operation.
run_count The number of instances which were running at the end of the interval.
success_count The number of instances which completed successfully during the interval.
failure_count The number of instances which completed unsuccessfully during the interval.
plan_warnings The number of warnings generated during query execution.
plan_info A high-level information of the plan. NULL if not information was collected.

mv_query_column_usage

The mv_query_column_usage view in the information_schema database provides information about the usage of columns by queries in the workload. Details about column that are used in joins, filters, group-bys, order-bys or reshuffles help to understand the frequency and cost of use of columns, and make better decisions about indexing and sharding of data.

Column name Description
activity_name The ID associated with the query. This will be the activity_name of all query tasks associated with the query.
database_name The name of the database, or NULL if none could be assigned.
table_name The name of the table in the query.
column_name The name of the column that exists in the table.
equijoins The number of times this column was involved in an equijoin in the query.
non_equijoins The number of times the column was involved in a non-equijoin in the query.
equality_preds The number of times the column was involved in equality predicates in the WHERE or ON clause in the query.
inequality_preds The number of times the column was involved in inequality predicates in the WHERE or ON clause in the query.
groupbys The number of times the column was involved in a GROUP BY clause in the query.
orderbys The number of times the column was involved in a ORDER BY clause in the query.
reshuffles The number of times the column was member of reshuffle key in the query.
outputs The number of times the column was returned as the result of the query.

mv_row_change_counts

The mv_row_change_counts view in the information_schema database returns a row for each partition of each table with autostats (automatic statistics) hosted in the cluster, along with a change count. These statistics are in-memory and show the number of changes (inserts, updates, and deletes) that have been applied to the table partition since it became online on the host.

Column name Description
table_name The name of the table in the database.
database_name The name of the database associated with the activity.
partition The table partition in the database.
changed The count of changes (inserts, updates, and deletes) for a table partition.
token The token associated with the table partition.

mv_sysinfo_cpu

The mv_sysinfo_cpu view in the information_schema database describes the total CPU usage breakdown of MemSQL and other processes per node.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
type MA, Leaf, or CA
memsql_total_cumulative_ns CPU usage by the MemSQL process since its startup.
memsql_user_cumulative_ns CPU usage by the MemSQL process, in user mode, since process startup.
memsql_system_cumulative_ns CPU usage by the MemSQL process, in kernel mode, since process startup.
total_used_cumulative_ns CPU usage since the startup of the machine. It refers to the whole machine, and not to MemSQL cgroup.
user_used_cumulative_ns CPU usage in user mode since the startup of the machine.
nice_cumulative_ns CPU usage in nice mode since the startup of the machine.
system_cumulative_ns CPU usage in kernel mode since the startup of the machine.
idle_cumulative_ns CPU idle time since the startup of the machine.
iowait_cumulative_ns CPU waiting time for I/O since the startup of the machine.
irq_cumulative_ns Time spent on servicing interrupts.
softirq_cumulative_ns Time spent on servicing soft interrupts.
steal_cumulative_ns Stolen time, which is the time spent in other operating systems when running in a virtualized environment.
guest_cumulative_ns Time spent running a virtual CPU for guest operating systems under the control of the Linux kernel.
guest_nice_cumulative_ns Time spent running a nice guest (virtual CPU for guest operating systems under the control of the Linux kernel).
cfs_quota_ns The amount of time in nanoseconds that the cgroup (that this MemSQL process is a member of) is allowed to spend per cfs_period_ns.
cfs_period_ns Used in conjunction with cfs_quota_ns.
num_cpus The number of cores on host.
timestamp_ns The time when the data was received.

mv_sysinfo_cpulist

The mv_sysinfo_cpulist view in the information_schema database describes the total CPU usage breakdown of MemSQL and other processes per core. To get the breakdown per host, aggregate the values for each core grouped by host.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
type MA, Leaf, or CA
cpu_id The ID of the core.
total_used_cumulative_ns Per core CPU usage since the startup of the machine.
user_used_cumulative_ns Per core CPU usage, in user mode, since the startup of the machine.
nice_cumulative_ns Per core CPU usage, in nice mode, since the startup of the machine.
system_cumulative_ns Per core CPU usage, in kernel mode, since the startup of the machine.
idle_cumulative_ns Per core CPU idle time since the startup of the machine.
iowait_cumulative_ns Per core CPU waiting time for I/O since the startup of the machine.
irq_cumulative_ns Time spent on servicing interrupts on the core.
softirq_cumulative_ns Time spent on servicing soft interrupts on the core.
steal_cumulative_ns Stolen time, which is the time spent in other operating systems when running in a virtualized environment.
guest_cumulative_ns Time spent running a virtual CPU for guest operating systems under the control of the Linux kernel.
guest_nice_cumulative_ns Time spent running a nice guest (virtual CPU for guest operating systems under the control of the Linux kernel).
timestamp_ns The time when the data was received.

mv_sysinfo_disk

The mv_sysinfo_disk view in the information_schema database describes the total disk usage breakdown of MemSQL and other processes.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
type MA, Leaf, or CA
mount_name The name of the mount_point for directories in memsql_dirs.
mount_point The location of the mount.
memsql_dirs The comma separated list of MemSQL directories (data, plancache, tracelogs) that are tracked.
mount_total_b The total size of the disk, in bytes, for mount_point.
mount_used_b The total bytes used by the disk at mount_point.
read_cumulative_b The total bytes read from the disk across all mount points since the starting of the process.
write_cumulative_b The total bytes written to the disk across all mount points since the starting of the process.
timestamp_ns The time when the data was received.

mv_sysinfo_mem

The mv_sysinfo_mem view in the information_schema database describes the total memory usage breakdown of MemSQL and other processes.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
type MA, Leaf, or CA
host_total_b The memory available on the physical host.
host_used_b The total memory used on the physical host.
cgroup_total_b The memory limit for the MemSQL node_id based on its cgroup membership.
cgroup_used_b The memory used by all processes of MemSQL cgroup.
memsql_b The memory used by MemSQL process specified by node_id.
timestamp_ns The time when the data was received.

mv_sysinfo_net

The mv_sysinfo_net view in the information_schema database describes the total network usage by interface.

Column name Description
node_id The ID of the node.
ip_addr The IP address of the node.
port The port on which the node is listening.
type MA, Leaf, or CA
interface The name of the interface.
received_cumulative_b The total number of bytes received on the network.
transmitted_cumulative_b The total number of bytes transmitted on the network.
timestamp_ns The time when the data was received.